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Finding the Fourth Proportional to 113,608, 156,719.40 and 86,703.64

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Solution

The fourth proportional to 113,608, 156,719.40 and 86,703.64 is: 119,605.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    113,608 : 156,719.40 = 86,703.64 : x
  2. Step 2: Convert to fraction form
    113,608/156,719.40 = 86,703.64/x
  3. Step 3: Cross multiply
    113,608x = 156,719.40 × 86,703.64
  4. Step 4: Simplify right side
    113,608x = 13,588,142,438.62
  5. Step 5: Solve for x
    x = 13,588,142,438.62/113,608
  6. Step 6: Final answer
    x = 119,605.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.